Transport 00:00
Sound bed pink / surf masking
DJ Gateway MIDI: off
Layers editing A
| Mode | Carrier (Hz) | Beat (Hz) | Level dB | L / R actual | Band |
|---|
503[4.2] = beat 4.2 Hz between carriers equally spaced around 503 Hz → L 500.9 / R 505.1 (sbagen/USENET measurement convention). l/r 100/104 = literal left/right.Spectrum 0–1000 Hz · L ■ R ■
Scope L/R waveforms (the beat is the slow envelope)
Reference
What the numbers come from
Measured Gateway tapes (spectrum analysis posted to USENET, archived in SBaGen's focus.txt). F10 = 100[1.5] 200[4.0] 250[4.0] 300[4.0]; F12 adds alpha overlays 400[10.0] 500[10.1] 600[4.8] while keeping the F10 theta bed; F15 adds 500[7.05] 630[7.0] 750[7.0]; F21 is 200/250/300[4.0] + 600/750/900[16.2]; F23–F27 use 400–900 Hz carriers at 3.9–4.2 Hz, F24/F27 add a 50 Hz carrier at 0.75–0.8 Hz. Tones sat ≈20 dB above pink noise/surf. The Institute's gear was analog, so the originals drifted; this app does not.
Own measurements of the Gateway Experience exercises (Oct 2026, 42 tapes, Wave I–VII) – 32.8 s FFT windows (0.03 Hz bins) averaged per 2 min, L/R peaks paired; see docs/gateway_collection_measurements_2026.md. The digital remasters use exact values: F10 = 50[0.25] 100[1.5] 200[4] 250[4] 300[4], F12 adds 400/500/600[10.0] (not 10.1 / 4.8), F15 = 500/630/750[7.2] (Wave V 2004: 507.5[7.3] 603[-7.3] 803.5[-7.3]), F21 = theta bed + 600/755/900[16] (bed dropped after ~4 min). Wave VII (2019) relabels the ladder: F23 = 200[-4] 250[4] 259[-4] 400[-7.5], F25 = 4 Hz on 200–900 Hz, F27 = 504/600/755/900[4], all over a constant 49[-0.4] drone. A negative beat means the right ear gets the lower tone; the Institute mixes polarities deliberately (Energy Bar Tool, Living Body Map and Free Flow 12 are fully reversed). Nearly every exercise ends with 475[16] 600[16]. Wave III and the analog Wave IV tapes are only measurable during induction and return (values ±1 Hz). The "Tape …" sequencer programs replay the measured timelines.
Monroe patents US 3,884,218 (1975), 5,213,562 (1993), 5,356,368 (1994): binaural beats need carriers < ~1500 Hz; 275 Hz cited as "most effective harmonic carrier"; the Septon (L 200/204/208, R 204/208/212 → 3 binaural + 4 monaural 4 Hz beats); "phased pink sound" with a 6 s pan cycle; sleep program alpha → theta → delta → theta in ~90 min cycles; 400/416 Hz (16 Hz beta) wake-up.
CIA / US Army "Analysis and Assessment of Gateway Process" (McDonnell, 1983; CIA-RDP96-00788R001700210016-5): beats are delivered at a "virtually subliminal, marginally audible level" together with pink/white noise and surf; the body is brought to a ~7–7.5 Hz resonance (Bentov); the three OBE conditions are (1) ~7 Hz quiet, (2) hemisphere sync, (3) right-hemisphere beta stimulation — the OBE tape reportedly used beta "around 2877.3 CPS" (most plausibly a misprint of ≈28.77 Hz; offered here as a 28.8 Hz beta layer). The paper also notes that Focus 15 "involves further expansion… through the inclusion of additional levels of sound… an intensification of the basic Hemi-Sync frequencies" — consistent with the measured F15 set (F10 bed + 500/630/750 Hz at ~7 Hz) — and (page 25) that an ex-trainer could "guarantee" OBEs by applying Hemi-Sync once participants were in REM sleep; i.e. timing the beta step to a REM window (≈90 min after sleep onset) matters as much as the frequencies. Full OCR text and the PDF are in docs/.
Atwater, "The Hemi-Sync Process" (TMI Research, 1999): beats are detected in the superior olivary nuclei; multiplexed binaural beats mixed with music, pink sound and surf.
Focus levels (Monroe's labels)
- F3 – basic hemispheric sync · F10 – mind awake / body asleep · F12 – expanded awareness · F15 – no time · F21 – bridge to other energy systems · F22 – humans in unconscious/chaotic states · F23 – recently deceased · F24–26 – belief-system territories · F27 – "the Park".
Focus levels are labels for states, not single Hz values. The Institute never published an official chart; the tables here are the best public measurements plus Monroe's patents.
How to use it well
- Stereo headphones are mandatory — binaural beats do not exist in mono or on speakers. Use ◀ L / R ▶ to confirm channels.
- Keep tones just above the noise bed (master around −18 to −30 dB). Louder is not deeper.
- Transitions matter more than targets: 0.5 Hz/min descents, long glides, and let the sequencer Hold a step when you are not ready to move on.
- Expect "nothing" for the first weeks of F10. Stop if you feel distressed. Not for people with epilepsy, pacemakers, or while driving.
Engine precision
Each tone is generated in an AudioWorklet with a float64 phase accumulator (phase += f / sampleRate), so frequency error is bounded by the audio clock (≈ parts per million), not by float32 oscillator parameters or codec artefacts. Frequency and level changes glide linearly per sample. The WAV exporter runs the identical code offline.